ITGS Chapter 8 to page 284
Terms
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- satellites that match the earht's rotation so they can hang in a stationary position relavtive to the spinning planet below, relaying wireless transmissions between locations
- geostationary communications satellites
- technology of long-distance communications
- telecommunications
- Multiple personal computers connected on a network.
- local area network (LAN)
- connected by cables, which serve as pathways for transporting data between machines
- node
- most common type of LAN; contains copper wires that resemble those in standard telephone cables.
- twisted pair
- A network in which a node has a tiny radio or infrared transmitter connected to its network port so it can send and receive data through the air rather than through cables.
- wireless network
- take care of the behind-the-scenes details so others can focus on using the network.
- network administrators
- large,complex networks with hundreds of computers
- enterprise network systems
- track and maintain healthy networks
- network management system software
- service that links two or more LAN's within a city
- Metropolitan area network (MAN)
- network that extends over a long distance
- wide area network (WAN)
- data is transmitted long-distance betwen networks on a collection of common pathways known as-
- backbone
- Hardware devices that can pass messages between networks.
- bridge
- Computers connected to two networks that translate communication protocols and transfer information between the two.
- gateway
- Programs or devices that decide how to route Internet transmissions.
- routers
- A Defense Department system with 24 satellites that can pinpoint any location on the Earth.
- Global Positioning System (GPS)
- use signals to broadcast by three or four visible satellites to determine its position
- GPS receiver
- specializede terminal linked to a bnaks's main computer through a commerical banking network
- Automated Teller Machine (ATM)
- dedicated, direct connection to the Internet through a LAN, with the computer having its own IP address.
- direct connection
- Network access via phone line, TV cable system, or wireless link.
- remote access
- Socket that allows information to pass in and out.
- port
- enable bits to pass through in groups of 8,16, or 32
- parallel ports
- require bits to pass through one at a time
- serial ports
- ports that are much faster and more flexible than traditional serial and parallel ports
- USB and FIREWIRE(IEEE 1394)
- Card that adds an additional serial port to a computer. The port is especially designed for a direct network connection.
- network interface card (NIC)
- A popular networking architecture developed in 1976 at Xerox
- ethernet
- A stream of bits.
- digital signal
- A continuous wave.
- analog signal
- Modulator/demodulator. A hardware device that connects a computer to a telephone line.
- modem
- installed on a circuit boarde insdie the computer's chassis
- internal modem
- sits in a box linked to a serial port or USB port
- external modem
- The standard unit of measure for modem speed.
- bits per second
- The quantity of information that can be transmitted through a communication medium in a given amount of time.
- bandwidth
- connection with much greater bandwidth than modems have
- broadband connection
- High-capacity cable that uses light waves to carry information at blinding speeds.
- fiber-optic cables
- fastest growing wireless LAN technology
- Wi-Fi or 802.11b
- A type of wireless technology that enables mobile phones, handheld computers, and PCs to communicate with each other regardless of operating system.
- bluetooth
- network that links a variety of perswonal electionic devices so they can communicate with each other
- personal area network (PAN)
- promises high-bandwidth connections that will support true multimedia
- 3G